Bhagavadgeeta Verse 4.15
एवं ज्ञात्वा कृतं कर्म पूर्वैः अपि मुमुक्षुभिः ।
कुरु कर्म एव तस्मात् त्वं पूर्वैः पूर्वतरं कृतम् ॥ ४.१५ ॥
ಏವಂ ಜ್ಞಾತ್ವಾ ಕೃತಂ ಕರ್ಮ ಪೂರ್ವೈಃ ಅಪಿ ಮುಮುಕ್ಷುಭಿಃ |
ಕುರು ಕರ್ಮ ಏವ ತಸ್ಮಾತ್ ತ್ವಂ ಪೂರ್ವೈಃ ಪೂರ್ವತರಂ ಕೃತಮ್ || ೪.೧೫ ||
EvaM j~jAtvA kRutaM karma pUrvaiH api mumukShubhiH |
kuru karma Eva tasmAt tvaM pUrvaiH pUrvataraM kRutam || 4.15 ||
With such knowledge, duties were performed even by the ancients who sought after Moksha. Therefore you too must perform karma which was observed by the ancients and which is still more ancient.